The plasma frequency is given by \(\omega _p = 8980 \sqrt{n_q[\text{cm}^{-3}]} \text{ Hz}\) , with \(n_q\)  the free charge density of the plasma. We estimate \(n_q\)  based on the deposited energy density \(\rho _E\)  in the ice, using \(n_q = \rho _E/(50 \text{ eV})\) . As indicated in Figure REF , the plasma reaches plasma frequencies of 100 MHz and higher, which agrees well with realistic RADAR designs [1]}.
